Test for wallpaper preference layout crash.

Test: runtest --path tests/unit/src/com/android/settings/WallpaperPreferenceLayoutTest.java

Bug: 31489007
Change-Id: I3c8440e84f3c169ac97ab13efde7ea7fa2027352

tests/unit/src/com/android/settings/WallpaperPreferenceLayoutTest.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings;
+
+import android.support.test.InstrumentationRegistry;
+import android.support.test.filters.SmallTest;
+import android.support.test.runner.AndroidJUnit4;
+import android.view.LayoutInflater;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@SmallTest
+@RunWith(AndroidJUnit4.class)
+public class WallpaperPreferenceLayoutTest {
+    @Test
+    public void testInflateWallpaperPreferenceLayout_doesNotCrash() {
+      LayoutInflater.from(InstrumentationRegistry.getTargetContext())
+          .inflate(R.layout.preference_wallpaper_type, null, false);
+    }
+}